题干
.
—I can’t find Mr. Smith. Where did you last see him this morning?
—It was in the hotel _______ he stayed.
—I can’t find Mr. Smith. Where did you last see him this morning?
—It was in the hotel _______ he stayed.
A：that
B：where
C：which
D：since
答案(点此获取答案解析）
B
，若点
为平面区域
的最大值是（ ▲ ）